X×(1-2/5)+(72-X)×(1-5/9)=39

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X×(1-2/5)+(72-X)×(1-5/9)=39X×(1-2/5)+(72-X)×(1-5/9)=39X×(1-2/5)+(72-X)×(1-5/9)=39X×(1-2/5)+(72-X)×(1

X×(1-2/5)+(72-X)×(1-5/9)=39
X×(1-2/5)+(72-X)×(1-5/9)=39

X×(1-2/5)+(72-X)×(1-5/9)=39
X×(1-2/5)+(72-X)×(1-5/9)=39
3/5X+32-4/9X=39
3/5X-4/9X=39-32
7/45X=7
X=7÷7/45
X=45

x*3/5+72*4/9-x*4/9=39
27x/45-20x/45+32=39
7x/45=7
x=7*45/7
x=45

X×(1-2/5)+(72-X)×(1-5/9)=39
3/5X+(72-X)×4/9=39
3/5X+32-4/9X=39
7/45X=7
X=45

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